Fukushima radiation isn't affecting American fisheries... yet.

How are radioactive isotopes leaking from northeastern Japan's crippled nuclear plant affecting U.S. marine environments? The short answer so far: not much. According to a recent report prepared for Congress , Americans, including Hawaiians and West Coast residents, can rest easy at this point about excess nuclear glow from seafoods caught in U.S. Pacific Ocean waters. But the report also details many known unknowns about the Fukushima Daiichi nuclear plant disaster's ultimate impacts on marine environments, as well as the fish we love to eat. These open questions include: How much radioactive material will rainfall deposit into the ocean? Will radioactive elements accumulate in the marine food chain? Will migratory animals like Pacific tuna -- not known to be at all concerned with the nation-state boundaries we impose upon the ocean -- carry them into the U.S. food supply...